Simplify schema.

src/zod-util.ts

@@ -0,0 +1,48 @@
+import { z } from 'zod';
+
+/**
+ * Recursively remove defaults from a zod schema.
+ *
+ * See: https://github.com/colinhacks/zod/discussions/845#discussioncomment-1936943
+ *
+ * @param schema The Zod schema.
+ * @returns A new Zod schema.
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function deepRemoveDefaults<T extends z.ZodTypeAny>(schema: T): any {
+  if (schema instanceof z.ZodDefault) {
+    return deepRemoveDefaults(schema.removeDefault());
+  }
+
+  if (schema instanceof z.ZodObject) {
+    const newShape = {};
+
+    for (const key in schema.shape) {
+      const fieldSchema = schema.shape[key];
+      newShape[key] = z.ZodOptional.create(deepRemoveDefaults(fieldSchema));
+    }
+    return new z.ZodObject({
+      ...schema._def,
+      shape: () => newShape,
+    });
+  }
+
+  if (schema instanceof z.ZodArray) {
+    return z.ZodArray.create(deepRemoveDefaults(schema.element));
+  }
+
+  if (schema instanceof z.ZodOptional) {
+    return z.ZodOptional.create(deepRemoveDefaults(schema.unwrap()));
+  }
+
+  if (schema instanceof z.ZodNullable) {
+    return z.ZodNullable.create(deepRemoveDefaults(schema.unwrap()));
+  }
+
+  if (schema instanceof z.ZodTuple) {
+    return z.ZodTuple.create(
+      schema.items.map((item: z.ZodTypeAny) => deepRemoveDefaults(item)),
+    );
+  }
+  return schema;
+}